Ancient Greek philosophers thought that light consisted of many particles.
Huygens was the first scientist that believed that light was in fact a wave.
The light theory was supposted by the fact that light seemed to move in a straight line instead of spreading out like a wave.
Scientist now agree that light has a dual nature, part particle and part wave.
The speed of light
Speed of Light = extra distance traveled
extra time measued
Materials which absorbe light witout re-emmitting it are called opaque. when light goes in the enrgy will be transformed into heat. Electromagnetic waves
Polarization
Used in sunglasses to block out rays of sun
Light will pas through a pair of sunglasses when their polarazation axes are aligned, but not when they are crossed at right angles.
Light can also be polarized by reflecting off of a surface, if light bounces off of a horizontal surface at a low angle it will bevome horizontally polirized.
Polirized light is used to produce 3D images. Two projectors are used at one time, one projector has a horizontal filter and the other has a vertical lens filter.
Early Concepts of light
- Ancient Greek philosophers thought that light consisted of many particles.
- Huygens was the first scientist that believed that light was in fact a wave.
- The light theory was supposted by the fact that light seemed to move in a straight line instead of spreading out like a wave.
- Scientist now agree that light has a dual nature, part particle and part wave.
The speed of light- Speed of Light = extra distance traveled
Materials which absorbe light witout re-emmitting it are called opaque. when light goes in the enrgy will be transformed into heat.extra time measued
Electromagnetic waves
As you can tell from the diagram above. The waves get smaller and have a higher frequency.
Shadows
Polarization
Used in sunglasses to block out rays of sun
Light will pas through a pair of sunglasses when their polarazation axes are aligned, but not when they are crossed at right angles.
Light can also be polarized by reflecting off of a surface, if light bounces off of a horizontal surface at a low angle it will bevome horizontally polirized.
Polirized light is used to produce 3D images. Two projectors are used at one time, one projector has a horizontal filter and the other has a vertical lens filter.